[sdiy] SVF problems

[patchell]

    That circuit won't work as drawn...there is a positive feedback loop around
U1 and U2 through the Q pot....Move R5 from the Negative input of U1 to the
Positive input, and it should work....

Stephen Begin wrote:

> I'm trying to put together this little circuit from Magnus's page
>
> http://home.swipnet.se/cfmd/synths/schematics/svf1.pdf
>
> and I've tried twice on breadboard, and both times i end up with a signal
> that is so distorted it's hard to tell if the filters are even working, and
> for about 9/10th of the range of the pots, i get no signal at all.
>
> I'm really not very experienced here so i'm wondering if maybe there is
> something that is assumed in this schematic that i don't know
> of...basically, I got the pinouts for the two chips, and made the
> appropriate connections (or tried).  Are there supposed to be power supply
> bypass caps or anything like that?
>
> Also, forgive me for even asking, but does the p1a and p1b mean it's a dual
> pot?
>
> Thanks,
> Steve

--
 -Jim
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